View of the Moffat Filter Plant in Lakewood (Jefferson County), Colorado. The building is a three story Art Deco Style structure embellished with decorative terra cotta tiles. Cars are parked nearby; strato cumulus clouds span the sky.

Pine trees stand on a hillside in the foreground in this view looking north toward a ridge of mountains in the distance from Berthoud Pass on the border of Clear Creek and Grand counties in Colorado. Small patches of snow are on the mountains in...

View of the dolphin fountain at the Sullivan Memorial Gateway at the Colfax Avenue entrance to the City Park Esplanade in the City Park neighborhood of Denver, Colorado. The gateway has ornate pylons with columns; cumulus clouds fill the sky.

View of Boulder, Colorado; shows the sandstone courthouse, Masonic Temple, and Methodist Church, with cupolas, towers, and pediments. Letters on the side of the Boulder Milling Company read: "Lily White Flour." University Avenue is a dirt street,...

View of rock formations identified as the Coke Ovens in Colorado National Monument in western Colorado. The sandstone rock monoliths and formations are outlined by shadows. Cumulus clouds are on the horizon.

Panoramic, aerial view of layered oil shale rock formations of the Roan Cliffs in Garfield County, Colorado. Shows Logan Wash in a valley near Mount Logan, the Colorado River, an extinct volcanic crater, and North Mamm Peak in the distance.

View from 71st and Monaco of the Derby Elementary School at 6500 East 72nd Avenue, in Commerce City (Adams County), Colorado. Modern architectural elements include masonry construction, entry doors, factory windows, and flat roofs. Strato cumulus...

Patches of snow remain on Arapaho Peak during the summer in this distant view from the head of Gamble Gulch in Gilpin County, Colorado. Arapaho Peak is on the border of Boulder and Grand Counties. Cumulus and cirrus clouds fill the sky.

View of the Sullivan Memorial Gateway at the Colfax Avenue entrance to the City Park Esplanade in the City Park neighborhood of Denver, Colorado. The terra-cotta fountain has statuary that includes dolphins, lizards, and frogs. The statue 'Mining'...

Arapaho Peak is in the distance on the border of Grand and Boulder counties in Colorado in this view from the Tip Top Mine near Perigo in Gilpin County. Patches of snow dot the peaks; strato cumulus and cirrus clouds dot the sky.

Panoramic view of eroded sandstone mesas and steep canyon walls near what is identified as Bissell's Point at Grand Canyon National Park, Arizona. Shows sedimentary rock layers, the Colorado River, and cumulus clouds.

Norlin Library, at the University of Colorado at Boulder, a building of random-coursed, rusticated local sandstone, has pale stone trim and a semicircular bay with square columns. The terra-cotta roof has an eclectic line of gables, slopes, and...

View of Silverton (San Juan County) Colorado; shows the Silverton reservoir, sheds and tracks of the Silverton Gladstone and Northern Railroad, Reese and Greene Streets, and the school. A wagon and team approach the Cement Creek bridge; the...

View of forest and snow capped peaks near Jones Pass on the border of Clear Creek and Grand Counties in Colorado. Felled timber and road grade is on a hillside; stratus, cumulus, and cirrus clouds fill the sky.

A man ringing a bell approaches on Eureka Street in Central City (Gilpin County), Colorado; Teller House, the First National Bank block, City Hall, William's Stables building, and the Registry Block are to the sides. People crowd sidewalks; cumulus...

View of Gregory Street in Central City (Gilpin County), Colorado. Frame houses are by mine tailings; the U. P. R. Mill is in the distance. Stratus, cumulus, and cirrus clouds fill the sky over the hills.